Default Memo pad fhd 10 brick

Hello i'm french sorry for my english

So i've got an asus memo pad fhd 10 me302c and she doesn't want to boot

she boot and stay to the image asus nothing else happen

i tryed this command
fastboot erase cache
fastboot erase system
fastboot -w
fastboot flash system sys5011.gz ( wiith the file of the forum)
and she doesn't boot
then i try to flash an ota nothing else

How must i proceed?

Thanks a lot.